| Package | Affected versions | Patched versions |
|---|---|---|
| http server | = 2.4.1= 2.4.10= 2.4.12= 2.4.16= 2.4.17= 2.4.18= 2.4.2= 2.4.20= 2.4.23= 2.4.25= 2.4.26= 2.4.27= 2.4.28= 2.4.29= 2.4.3= 2.4.4= 2.4.6= 2.4.7= 2.4.9 |
In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.
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